The term negative reinforcer is identified in base64 scheme by the sequence bmVnYXRpdmUgcmVpbmZvcmNlcg==, while the MD5 signature is equal to 53871acbcf1b755df4510f643c9301b8. The ASCII encoding of negative reinforcer in hexadecimal notation is 6e65676174697665207265696e666f72636572.